public static async Task <TweetProcessingData> ProcessTweet(
[OrchestrationTrigger] IDurableOrchestrationContext context,
ILogger log)
{
TweetProcessingData tpd = context.GetInput <TweetProcessingData>();
if (!context.IsReplaying)
{
log.LogInformation("P_ProcessTweet call A_GetBusinessLogicScore");
}
// The following function is not async, so it could be called directly rather than through the activity model.
PublishLabel tmpLabelBL = PublishLabel.NotAssigned;
(tpd.Score, tmpLabelBL, tpd.TextWithoutTagsHighlighted) = await
context.CallActivityAsync <Tuple <double, PublishLabel, string> >("A_GetBusinessLogicScore", tpd.TextWithoutTags);
tpd.LabelBL = (int)tmpLabelBL;
if (tpd.LabelBL != (int)PublishLabel.Negative)
{
log.LogInformation("Minimum BL score exceeded, query ML filter.");
var mlResult = await context.CallActivityAsync <MlResult>("A_GetMlScore", tpd.TextWithoutTags);
tpd.ScoreML = mlResult.Score;
tpd.LabelML = (int)mlResult.Label;
tpd.VersionML = mlResult.MlVersion;
if (!(tpd.VersionML is null))
{
log.LogInformation(
$"ML-inference OK, label: {tpd.LabelML}, "
+ $"score: {tpd.ScoreML.ToString("F", CultureInfo.InvariantCulture)}, "
+ $"version: {tpd.VersionML}");
}
else
{
// Did not get a reply from the ML function, therefore
// we fall back and continue according to the traditional
// logic's result; indicated by tpd.VersionML is null.
log.LogInformation("ML inference failed or did not reply, rely on conventional logic.");
}
}
public static async Task <List <TweetProcessingData> > GetTweets([ActivityTrigger] string lastTweetId, ILogger log)
{
log.LogInformation($"A_GetTweets: Getting new tweets after {lastTweetId}.");
KeyVaultAccessor kva = KeyVaultAccessor.GetInstance();
string apiKey = await kva.GetSecretAsync("TwitterApiKey"); // aka consumer key
string apiSecretKey = await kva.GetSecretAsync("TwitterApiSecretKey"); // aka consumer secret
string accessToken = await kva.GetSecretAsync("TwitterAccessToken");
string accessTokenSecret = await kva.GetSecretAsync("TwitterAccessTokenSecret");
string monitoredTwitterAccount = Environment.GetEnvironmentVariable("MonitoredTwitterAccount");
List <TweetProcessingData> tpds = new List <TweetProcessingData>(); // return value, empty list if Twitter connection failure
var userCredentials = Auth.SetUserCredentials(apiKey, apiSecretKey, accessToken, accessTokenSecret);
try
{
// This variable is not used later, but seems to leave an id for the library.
var authenticatedUser = User.GetAuthenticatedUser(userCredentials);
}
catch (AggregateException ae)
{
// Inserted try-catch after a seemingly intermittent exception that lead to
// the service stopping completely, 20210102, ca. 11 am.
log.LogWarning($"A_GetTweets: User authentication failure: {ae.Message}. Return no tweets and retry in next cycle.");
return(tpds);
}
// Note: The following does NOT get MaximumNumberOfResults tweets
// from after lastTweetId!!! Rather it gets the most recent
// tweets with the early limit defined by lastTweetId OR the
// defined maximum, whichever is more limiting!
// (Therefore, in order to test on past tweets, one may need
// to increase MaximumNumberOfResults considerably to get ALL
// tweets from the one targeted to the current one.
SearchTweetsParameters searchParameter = new SearchTweetsParameters($"from:{monitoredTwitterAccount}")
{
MaximumNumberOfResults = 15,
SinceId = long.Parse(lastTweetId)
};
IEnumerable <ITweet> tweets = null;
try
{
tweets = await SearchAsync.SearchTweets(searchParameter);
}
catch (Exception e)
{
// Inserted try-catch after a seemingly intermittent exception that lead to
// the service stopping completely, 20201213, ca. 7 am.
log.LogWarning($"A_GetTweets: SearchTweets failed with exception: {e.Message}");
}
if (tweets is null)
{
log.LogWarning($"A_GetTweets: Twitter connection failure. Return no tweets and retry in next cycle.");
return(tpds);
}
// Since the further processing can scramble the order again, we don't need to sort here.
foreach (var tweet in tweets)
{
// Copy the data that we need over to a serializable struct.
TweetProcessingData tpd = new TweetProcessingData();
tpd.IdStr = tweet.IdStr;
tpd.CreatedAt = tweet.CreatedAt;
tpd.FullText = tweet.FullText;
tpd.Hashtags = String.Join("|", tweet.Hashtags.Select(t => t.Text));
tpd.InReplyToStatusIdStr = tweet.InReplyToStatusIdStr;
tpd.Url = tweet.Url;
tpd.TextWithoutTags = TweetAnalysis.removeHashtagsFromText(tweet.FullText, tweet.Hashtags);
tpds.Add(tpd);
}
log.LogInformation($"A_GetTweets: Done, got {tweets.Count()} new tweets.");
return(tpds);
}